<!DOCTYPE html>
<html>
<head>
  <script type="application/javascript">
window.onload = function()
{
  document.getElementById("i")
          .setAttribute("width", 100);
};
  </script>
</head>
<body>
<iframe src="data:text/html,&lt;div style='position:fixed'&gt;foo&lt;/div&gt;"
        id="i" width="75" height="150"></iframe>
</body>
</html>
